JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
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  • Load image into Gallery viewer, JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
  • Load image into Gallery viewer, JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid
  • Load image into Gallery viewer, JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid

JB4 Tuner for 2023+ Mercedes-Benz C43/GLC/C63S AMG 2.0L Hybrid

£908.70
£908.70
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Tax included. Shipping calculated at checkout.

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Unlock serious performance from your 2023+ Mercedes-AMG C43, GLC 63 and C63 S E Performance with the JB4 plug-and-play tuner. Developed for the M139 2.0-litre turbo hybrid platform, this piggyback tuning box installs on two easy-to-reach engine connectors and safely raises turbocharger boost by around 3 to 6 psi. With integrated CANbus control rescaling timing and fueling, the JB4 delivers smooth, reliable power gains while retaining factory safety systems. Installation is fully reversible and there is no ECU unlock or flagging required.

  • Proven gains on pump fuel up to 50whp on the C43 and up to 100whp on the C63, with further potential on higher octane or E85 blends
  • Quick plug-and-play fit on top of the engine using two connectors, not VIN-locked and removable without a trace
  • CANbus OBDII integration for refined boost, timing and fueling control, improving 0 to 60 and quarter-mile times
  • Preloaded with up to 8 maps, including ethanol-compatible options and boost-by-gear control
  • JB4PRO app support to view and record up to 40 parameters, change maps and update firmware, with wireless smartphone connectivity available
  • OEM-like drivability in all modes and fuel economy unchanged during normal driving; 91 octane or better required for performance gains

Additional details: includes a rugged billet aluminium enclosure, designed and assembled in the USA, with a 5-year warranty. The JB4 offers far more functionality, safety and performance than typical chip tunes, making it a popular upgrade with Nforcd customers seeking a reversible ECU tune alternative for their AMG.

Vehicle fitment

  • 2023+ Mercedes-Benz C43 AMG 2.0L Turbo Mild Hybrid M139
  • 2023+ Mercedes-Benz GLC 63 AMG 2.0L Turbo Plug-In Hybrid M139
  • 2024+ Mercedes-Benz C63 S E Performance AMG 2.0L Turbo Plug-In Hybrid M139

Nforcd knows the JB4 platform inside out and keeps this AMG tuning box moving fast for UK owners. Ready to install? We offer professional fitting at Nforcd in Warwickshire. Request a fitting quote via Sales@nforcd.com and transform your AMG today.